Heat oven to 400F.,In s medium bowl, mix squash, onion, brown sugar, salt, black pepper and 1 1/2 tablespoons of the oil.,Spread mixture in ungreased 13x9-inch (3-quart) glass baking dish.,______,Spray large cookie sheet with cooking spray.,Unroll pizza crust dough on cookie sheet into 13x9-inch rectangle.,Bake at 400F 7 to 10 minutes or until light golden brown.,Meanwhile, in a 10-inch skillet, heat remaining 1/2 tablespoon oil over medium heat.,Add pancetta; cook 4 minutes, stirring frequently, until lightly browned.,Drain.,Spread pesto over partially baked crust.,Top with squash mixture, pancetta, roasted peppers, walnuts and cheeses.,Bake 6 to 8 minutes longer or until edges are golden brown.,Let stand 5 minutes before serving.